Function convertOpenRouterToRatioData

controller/ratio_sync.go:724–807

convertOpenRouterToRatioData parses OpenRouter's /v1/models response and converts per-token USD pricing into the local ratio format. model_ratio = prompt_price_per_token * 1_000_000 * (USD / 1000) since 1 ratio unit = $0.002/1K tokens and USD=500, the factor is 500_000 completion_ratio = completi

(reader io.Reader)

//
// completion_ratio = completion_price / prompt_price (output/input multiplier)
func convertOpenRouterToRatioData(reader io.Reader) (map[string]any, error) {
	var orResp struct {
		Data []struct {
			ID      string `json:"id"`
			Pricing struct {
				Prompt         string `json:"prompt"`
				Completion     string `json:"completion"`
				InputCacheRead string `json:"input_cache_read"`
			} `json:"pricing"`
		} `json:"data"`
	}

	if err := common.DecodeJson(reader, &orResp); err != nil {
		return nil, fmt.Errorf("failed to decode OpenRouter response: %w", err)
	}

	modelRatioMap := make(map[string]any)
	completionRatioMap := make(map[string]any)
	cacheRatioMap := make(map[string]any)

	for _, m := range orResp.Data {
		promptPrice, promptErr := strconv.ParseFloat(m.Pricing.Prompt, 64)
		completionPrice, compErr := strconv.ParseFloat(m.Pricing.Completion, 64)

		if promptErr != nil && compErr != nil {
			// Both unparseable — skip this model
			continue
		}

		// Treat parse errors as 0
		if promptErr != nil {
			promptPrice = 0
		}
		if compErr != nil {
			completionPrice = 0
		}

		// Negative values are sentinel values (e.g., -1 for dynamic/variable pricing) — skip
		if promptPrice < 0 || completionPrice < 0 {
			continue
		}

		if promptPrice == 0 && completionPrice == 0 {
			// Free model
			modelRatioMap[m.ID] = 0.0
			continue
		}
		if promptPrice <= 0 {
			// No meaningful prompt baseline, cannot derive ratios safely.
			continue
		}

		// Normal case: promptPrice > 0
		ratio := promptPrice * 1000 * ratio_setting.USD
		ratio = roundRatioValue(ratio)
		modelRatioMap[m.ID] = ratio

		compRatio := completionPrice / promptPrice